NFPA 13, 2007 8.4.7.2* Galvanized Pipe. 8.4.7.2.1 Where steel pipe is used in preaction and dry pipe systems, piping materials shall be limited to internally galvanized steel. 8.4.7.2.2 Nongalvanized fittings shall be permitted.
Preaction and dry systems are very similar in nature with a few exceptions. Both under normal operating conditions have no water in their piping. Preaction is a bit more complicated due to supervision of the piping and separate detection devices which evoke an opening of the preaction valve. Dry systems are setup to respond to the opening of a sprinkler head. Preaction systems, depending on what type you specify may require multiple steps before permitting water into the piping. There are multiple references in 13 where preaction systems are to be classified as dry systems, depending on type of sprinklers used and other factors. Look at 14.3.7.1, 15.3.6 for example. Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Eladio N. Alvarado Sent: Wednesday, September 09, 2009 9:05 AM To: Sprinklerforum Subject: Galvanized Pipe Would someone be good enough to direct me to the specific location where Galvanized pipe is required by 13 for Dry systems? And where it may be indicated that Pre-action systems are considered "Dry". I've been trying to find it on the On-line codes but I seem to be having trouble dealing with their search engine. Any help would be greatly appreciated. Eladio Alvarado AFSDII _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
